I need a solid state relay to control 120v AC with about 2v DC.

What I'm trying to do is control a light string with the relay. I just need something simple, where I can stick wires in and out.

What type of relay do I need?

I'm fairly new to these things so if you could point me in the right direction, that would be greatly appreciated. Thanks

  • \$\begingroup\$ What is the 2 V source? Is this to be like a "power bar" of sorts where you can add and/or subtract 120 VAC devices with a single 2 V controlling source? Or is this really a "light string" where a number of devices are in series to each other and only one string is being controlled? How much 120 VAC current is involved, worst case? Add as much info as you can. \$\endgroup\$
    – jonk
    Aug 28 '18 at 19:23
  • \$\begingroup\$ Basically, what I need is a solid state relay, that I can use 2v to open and allow 120v through \$\endgroup\$ Aug 28 '18 at 19:29
  • \$\begingroup\$ Are you just asking for a product number to buy, then? \$\endgroup\$
    – jonk
    Aug 28 '18 at 19:30
  • 1
    \$\begingroup\$ We don't do product recommendations here, since availablility of parts can be limited regionally. What is providing the 2 volt control signal? I think most solid-state relays require at least 3 volts to operate. \$\endgroup\$ Aug 28 '18 at 19:41
  • 2
    \$\begingroup\$ In order to know what is possible, you need to provide more information for the "about 2V" control signal. What is the possible voltage range and what current is available from the voltage source? What is generating the ~2V signal? \$\endgroup\$
    – crj11
    Aug 28 '18 at 22:23

Have a look at “triacs”. I believe you can use a Triac as a solid state A/C switch effectively and they’re inexpensive and widely available. You didn’t say how many amps you need to switch the load but there are a good range of Triac options to consider. Just make sure your gate voltage meets your needs.

More info on Triacs (Google is your friend on this one):



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